This heavy-duty mechanics length drill bit is made of high speed steel and has a 17/64 inch diameter shank. It is for use with alloy steel, carbon steel, cast iron, tool steel. This mechanics length drill bit has a black and gold finish, and has fractional inch measurements. It is non-coolant through with a 3⅝ inch length. Plus it has one 2⅛ inch spiral flutes, straight shank with three flats, right hand cutting direction, and a 135 Degrees split point.